NEET Chemistry: Periodic Classification of Elements questions with solutions

Q1. Write the correct alternatives: According to Mendeleev's periodic law, properties of elements are periodic function of their.

1. Atomic number
2. Atomic masses
3. Densities
4. Boiling points

Answer: Atomic masses

Mendeleev's periodic law states that the properties of elements are periodic functions of their atomic masses. The modern periodic law uses atomic number instead, but the original law was based on mass.

Q2. Which element has the most metallic character?

1. Boron
2. Aluminium
3. Indium
4. Thallium

Answer: Aluminium

Metallic character generally increases down a group, but in Group 13 the trend is not perfectly smooth. Aluminium is the most metallic here because boron is a metalloid, and indium and thallium are affected by stronger inert-pair effects that reduce their expected metallic behavior.